Inkjet width adjustment method and three-dimensional printing equipment

Abstract

An inkjet width adjustment method adapting to three-dimensional printing equipment is provided. The method in one of exemplary embodiments is provided hereafter. A three-dimensional digital model is obtained, and a slicing procedure is performed on the three-dimensional digital model to produce a layer object, wherein the layer object has a cross-sectional contour. A surface tilt degree corresponding to the cross-sectional contour is obtained from the three-dimensional digital model, and an ideal inkjet width of the layer object is calculated according to the surface tilt degree corresponding to the cross-sectional contour. After a print module is controlled to print the layer object, an inkjet module is controlled to spray ink along the cross-sectional contour of the layer object according to the ideal inkjet width. In addition, the three-dimensional printing equipment is also provided.

What is claimed is: 
     
       1. An inkjet width adjustment method adapted for printing a color three-dimensional object, comprising:
 obtaining a three-dimensional digital model, and performing a slicing procedure on the three-dimensional digital model to produce a layer object, wherein the layer object has a cross-sectional contour; 
 obtaining a surface tilt degree corresponding to the cross-sectional contour from the three-dimensional digital model, and calculating an adjusted inkjet width of the layer object according to the surface tilt degree corresponding to the cross-sectional contour; 
 controlling a printing module to print the layer object; and 
 after the printing module is controlled to print the layer object, controlling an inkjet module to spray ink along the cross-sectional contour of the layer object according to the adjusted inkjet width, 
 wherein the step of obtaining the surface tilt degree corresponding to the cross-sectional contour from the three-dimensional digital model, and calculating the adjusted inkjet width of the layer object according to the surface tilt degree corresponding to the cross-sectional contour comprises: 
 obtaining at least one polygon mesh corresponding to the cross-sectional contour from the three-dimensional digital model; 
 calculating at least one included angle between the at least one polygon mesh and a horizontal plane for representing the surface tilt degree; and 
 calculating the adjusted inkjet width of the layer object according to the at least one included angle, a layer thickness and a predetermined inkjet width. 
 
     
     
       2. The inkjet width adjustment method according to  claim 1 , wherein calculating the adjusted inkjet width of the layer object according to the at least one included angle, the layer thickness and the predetermined inkjet width comprises:
 calculating a product of a cotangent value of the at least one included angle and the layer thickness; and 
 taking a maximum value between the product and the predetermined inkjet width as the adjusted inkjet width of the layer object. 
 
     
     
       3. The inkjet width adjustment method according to  claim 1 , wherein the at least one polygon mesh comprises a first polygon mesh and a second polygon mesh, and calculating the at least one included angle between the at least one polygon mesh and the horizontal plane comprises:
 calculating a first included angle between the first polygon mesh and the horizontal plane, and calculating a second included angle between the second polygon mesh and horizontal plane. 
 
     
     
       4. The inkjet width adjustment method according to  claim 3 , wherein calculating the adjusted inkjet width according to the at least one included angle, the layer thickness and the predetermined inkjet width comprises:
 calculating a first adjusted inkjet width of the adjusted inkjet width according to the first included angle, the layer thickness and the predetermined inkjet width; and 
 calculating a second adjusted inkjet width of the adjusted inkjet width according to the second included angle, the layer thickness and the predetermined inkjet width. 
 
     
     
       5. The inkjet width adjustment method according to  claim 1 , further comprising:
 producing an inkjet image according to the adjusted inkjet width and the cross-sectional contour, wherein the inkjet image comprises an inkjet area formed based on the adjusted inkjet width. 
 
     
     
       6. Three-dimensional printing equipment adapted to print a color three-dimensional object, comprising:
 a printing module, comprising a printing head; 
 an inkjet module, comprising an inkjet head; 
 a storage device, recording a plurality of modules; and 
 a processing device, coupled to the storage device and configured to execute the modules to:
 obtain a three-dimensional digital model, and perform a slicing procedure on the three-dimensional digital model to produce a layer object, wherein the layer object has a cross-sectional contour; 
 obtain a surface tilt degree corresponding to the cross-sectional contour from the three-dimensional digital model, and calculate an adjusted inkjet width according to the surface tilt degree corresponding to the cross-sectional contour; 
 control the printing module to print the layer object; and 
 after the printing module is controlled to print the layer object, control the inkjet module to spray ink along the cross-sectional contour of the layer object according to the adjusted inkjet width, 
 
 wherein the processing device is configured to: obtain at least one polygon mesh corresponding to the cross-sectional contour from the three-dimensional digital model; calculate at least one included angle between the at least one polygon mesh and a horizontal plane for representing the surface tilt degree; and calculate the adjusted inkjet width of the layer object according to the at least one included angle, a layer thickness and a predetermined inkjet width. 
 
     
     
       7. The three-dimensional printing equipment according to  claim 6 , wherein the processing device is configured to: calculate a product of a cotangent value of the at least one included angle and the layer thickness; and take a maximum value between the product and the predetermined inkjet width as the adjusted inkjet width of the layer object. 
     
     
       8. The three-dimensional printing equipment according to  claim 6 , wherein the at least one polygon mesh comprises a first polygon mesh and a second polygon mesh, and the processing device is configured to: calculate a first included angle between the first polygon mesh and the horizontal plane; and calculate a second included angle between the second polygon mesh and the horizontal plane. 
     
     
       9. The three-dimensional printing equipment according to  claim 8 , wherein the processing device is configured to: calculate a first adjusted inkjet width of the adjusted inkjet width according to the first included angle, the layer thickness and the predetermined inkjet width; and calculate a second adjusted inkjet width of the adjusted inkjet width according to the second included angle, the layer thickness and the predetermined inkjet width. 
     
     
       10. The three-dimensional printing equipment according to  claim 6 , wherein the processing device is configured to: produce an inkjet image according to the adjusted inkjet width and the cross-sectional contour, wherein the inkjet image includes an inkjet area formed based on the adjusted inkjet width.